Metal-drilling machine



(No Model.)

- G. M. FRENC'HJL METAL DRILLING MACHINE.

No. 505,516. Patented Sept. 26, 1893` ttl h l um @umu-MMIII"ummm munt iiliillllllllllllllllllll autres STATES PATENT Price.

GEORGE M. rinunciare., OF CHICAGO, ILLINOIS.

` METAL-DRILLING' MACHINE.

SPECIFICATION forming part of Letters APatent No. 505,516, dated September 26, 1,893.

Application tiled October 22, 1892. Serial No. 449,887. (No model.)

To all whom tm/ay concern.-

l 3e it known that I, GEORGE M. FRENCH, Jr., a citizen of the United States, residing at Chi! cago, Illinois, have invented a new and useful Improvement in Metal-Drillin g Machines, of which the following isa specification. .l My invention relates to drills and has for its object to provide a sensitive drill, or one 1n whlch the operator will have a delicate control of the machine. It is illustrated in th accompanying drawings, wherein:

lhgure l, is a side view of the drill. Fig. 2, Is a front view. Fig. 3, is a detail partly 1n section. n Like parts are indicated by the same letter 1n all the iigures.

A is the body ofthe drill, preferably hollow, suitably supported on the standard B and having the upward projection C, the forward projections D, E, and the lower vertical adjustable arm` F. The upward projection G 1s provided with an aperture in which slides the longitudinal adjustable sleeve G. Within I this sleeve is the shaft G', having at one end the driving pulley G2, at the other the i friction wheel G3. Transversely through the bottom portion of the part C is the shaft J, having at one end the thumb piece J', with an inwardly roughened or corrugated surface J 2, opposed to a like surface J3, projecting latterally from the portion C of the `frame A. On the other end of the shaft J is the plate J 4 and between this plate and the walls of the part C is the spiral spring J5. On the shaft 1s the pinion J6 engaging a rack on the lower part of the sleeve G.

L is a plate on the upper end of the sleeve L', which has an annular groove L2 at its lower end. This sleeve is placed in a vertical aperture in the portion D in which it is free to rotate. The plate L covers or completes Y the top of the sleeve and rests on the top of the part D.

O is an arm pivoted within lthe frame A and. provided with the slot O', through which projects thepin O2 having at one end the plate O3 and at the other the thumb nut O4. The thumb nut is on one side and the plate on the other side of the arm O. 'lhe outer eXtrem- 1ty of the arm O is bifurcated, as indicated and its outer points lie in the annulus.

P is a link pivotally connected to the pin O2 and pivotally connected at its lower end to the pin P', which is provided with a plate P2 and thumb nut P3. The pin passes through the slot P4 in the hand lever P5, which is piv- Oted at P6 to the sleeve P7. The handle and the arm O are connected by the spring R. The sleeve P7 is free to move in the part E and to ita handleP, which is bifurcated so as to straddle the same is pivotally connected by the short screws P6 P6.

` .P8 is the drill rod having a'collar P9 near its lower end to abut against the sleeve, and a removable but normally fixed collar P10 at its upper end. The drill rod is slotted at P11 t0 receive the feather P12 on the inside of the sleeve L' so that the drill rod is free to rotate in the sleeve P7 and with the sleeve L'.

R is the drill bed suitably secured on the laterally projecting arm or portion F.

The use and operation of my invention are as follows: Assuming that the parts are in substantially the position indicated in the figures and that a drill has been inserted in or connected with the drill rod, the work will be placed upon the table R. By operating the handlePs, pushing the handle downwardly, the sleeve P7 in which the drill rod is free to rotate will be carried downwardly toward the Work, thus carrying with it the drill rod and the drill vuntil they are applied to the work. But as pressure is applied to the handle P5, the same being a lever, its inner end will rise, thus pushing upwardly upon the link P and raising the outer end of the arm O. This will move the sleeve L' upwardly so as to bring the plate L operatively against the friction wheel G3. It is assumed, of course that this friction wheel is in motion,being driven from the pulley G2 and it will communicate its Inotion to the plate L, thence to the sleeve L', thence to the rod and drill. The operation of the handle thus simultaneously applies the drill to the work and connects the driving mechanism and that too with an equality of action, for the harder the drill is pressed against the Work, the more powerfully is the plate L placed against the friction wheel and thus the greater power obtained. The device is sensitive to the tonch,and the hand of the operator will give him instant and constant notice of the variations in the work. The spring R will automatically restore all the parts to normal position out of engagement for operation. There is, of course, very little vertical motion of the sleeve L', and very little is required. The device can be adjusted by moving the pins O2 and P in their respective slots to any desired positions and when so adjusted they are easilylocked in position. By drawing the thumb nut J outwardly against the spring J5 the two interlocking corrugated surfaces will be disengaged, and by turning the thumb nut the shaft J will be turned and the pinion J3 will move the sleeve G longitudinally and thus bring the friction wheel G3 to a different position on the plate L thus varying the point of application of power. When the drill rod is to be removed by unloosening the screws P6 l?G the rod will be free to drop out, and by then unloosening the collar P10. the rod may be removed from the sleeve P7.

I do not of course desire to be limited to the specific devices and forms of construction here shown, and especially as some of these features could be utilized independent of the others.

l. In a drill the combination of a drill rod with a driving plate, a shaft parallel with such plate and having a friction wheel at one end and a shaft driving pulley or the like at the other end, and means foradjustingsnch shaft alongits length, said means consisting of a sleeve in which such shaft is journaled, and a rack and pinion associated with such sleeve, and a spring clutch piece associated with such pinion so that the pinion may be driven or locked into position thereby.

2. In a drill the combination of a friction driving device with a drill rod, a handle, a suitable connecting device whereby the drill and the friction devices are operatively moved simultaneously by the action of the handle.

3. The combination of a drill rod with a handle to depress the same, friction devices to drive the rod, connecting parts from such handle to such friction devices whereby the latter are pnt into operation by the motion of the former.

4. In a drill the combination of a drill rod with a handle for depressing the same against the work, friction devices for driving the drill rod, a lever connected with such friction devices at one end and fixedly connected at the other, and a link from the handle to the lever whereby the motion of the handle operatively applies the friction devices.

5. In a drill the combination of a drill rod with a handle for depressing the same against the work, friction devices for driving the drill rod, a lever connected with such friction devices at one end and tixedly connected at the other, and a link from the handle to the lever whereby the motion of the handle operatively applies the friction devices and aspring connecting the handle and the lever so as to automatically restore the parts to their position of disengagement when the handle is free.

6. In a drill the combination of adrill rod with a handle for depressing the same against the work, friction devices for driving the drill rod, a lever connected with such friction devices at one end and ixedly connected at the other, and a link from the handle to thelever whereby the'motion of the handle operatively applies the friction devices, said link longitudinally adj ustable'at each end respectively along the handle and the lever.

7. In a drill the combination of a drill rod with a handle fordepressing the same against the work, friction devices for driving the drill rod, a lever connected with such friction devices at one end and iixedly connected at the other, and a link from the handle to the lever whereby the motion of the handle operatively applies the friction devices, said link longitudinally adjustable at each end respectively along the handle and the lever, and a spring connecting the handle and the lever. p

GEORGE M. FRENCH, JR.

Witnesses:

WALTER J. GUNTHORP, EDITH BLACK.. 

